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Business Segments - Reconciliation of Revenue and Operating Income by Reportable Segment (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting Information [Line Items] |  |  |  |
Net service revenues | $ 1,552,132 | $ 1,466,226 | $ 4,537,047 | $ 4,318,613
Operating income | 162,891 | 151,138 | 468,522 | 435,016
Amortization of intangible assets | 339 | 429 | 1,022 | 1,334
Interest income, net | (1,230) | (1,196) | (3,768) | (2,937)
Income before income taxes | 163,782 | 151,905 | 471,268 | 436,619
Operating Segments | Temporary and consultant staffing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net service revenues | 1,118,461 | 1,083,766 | 3,305,800 | 3,238,028
Operating income | 101,428 | 102,707 | 312,684 | 303,000
Operating Segments | Permanent placement staffing |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net service revenues | 134,582 | 129,667 | 407,038 | 386,105
Operating income | 21,817 | 22,895 | 68,718 | 72,710
Operating Segments | Risk consulting and internal audit services |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Net service revenues | 299,089 | 252,793 | 824,209 | 694,480
Operating income | $ 39,646 | $ 25,536 | $ 87,120 | $ 59,306

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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